Polar AW200 Activity Watch User Manual
Watch Buttons
SPAIN L
Clock Modes and Menu Structure
3. BEFORE THE ACTIVITY
Everyday Use
The Polar AW200 Activity Watch can be worn on the wrist at all times. Not only will it tell you the date and time, but also the ambient temperature and atmospheric pressure trend, and help you anticipate any change in the weather.
Measurement of Altitude
The measurement of altitude is based on a simple principle: the air pressure decreases as altitude increases.
For the altitude values to be accurate, it is necessary
Read MoreOperating Systems: Deadlock, Memory Management, and Virtual Memory
Deadlock
18-Spin-lock:
General (counting) semaphore using busy waiting instead of blocking. Used in multiproc OS to implement short critical sections.
19-Deadlock:
Two or more procs are waiting indefinitely for an event that can be caused by only one of the waiting procs.
20-Starvation:
Indefinite blocking. A process may never be removed from the semaphore queue in which it is suspended.
21-Monitors:
A high-level abstraction that provides a convenient and effective mechanism for process synchronization.
Read MoreUnderstanding Storage Technologies: SCSI, FC, iSCSI, and More
SCSI vs. FC
Interface for internal storage to external disks, used with SAN. Potential downtime with SCSI. RAID controller is SCSI hardware, while HBA is Fibre Channel hardware. Media specific (copper only), but it can be media independent—copper or fibre optic.
FC vs. iSCSI
Fibre Channel (FC): Current market leader for shared storage technologies. Provides the highest performance levels and is designed for mission-critical applications. The cost of components is relatively high, particularly per
RAM (Random Access Memory) Types and Functions
RAM (Random Access Memory) is a type of memory that can be accessed randomly, meaning you can access any byte of memory without going through the preceding bytes. RAM is the most common type of computer memory and other devices such as printers.
Types of RAM
There are two basic types of RAM:
- DRAM (Dynamic RAM)
- SRAM (Static RAM)
The two types differ in the technology used to store data. Dynamic RAM needs to be refreshed thousands of times per second while static RAM does not need to be refreshed as often,
Read MoreClient-Server Computing and Windows Server Administration
Describe the components and purpose of a client server computing environment. Client/server is a program relationship in which one program (the client) requests a service or resource from another program (the server). Windows NT established a new file system called NTFS.
What were the two major versions of Windows NT?Server and Workstation
How did they differ in function?Server acted as a server in networks. Workstation was for stand-alone or client workstations
What made Windows 2000 such a security
Dijkstra’s Algorithm for Finding Shortest Paths in a Graph
Dijkstra’s Algorithm for Finding Shortest Paths in a Graph
Dijkstra’s algorithm is a greedy algorithm that solves the single-source shortest path problem on a weighted, directed graph. Given a graph with a source vertex, the algorithm finds the shortest path from the source vertex to every other vertex in the graph.
The Algorithm
- Initialize a distance array d, where d[v] represents the current best known distance from the source vertex to vertex v. Initially, set d[v] to infinity for all vertices except